A(n) ____ circuit has infinite resistance because no current flows through it.
A. open
B. closed
C. short
D. complete
Answer: A
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The conversion of cyclobutane 
to ethylene 
is a first-order reaction. This means that the concentration of cyclobutane at time t is given by lnC=ln
?kt, where C is the concentration at time t, is the initial concentration, t is the time since the reaction started, and k is the rate constant. Assume that =0.2 mol/L with negligible uncertainty. After 300 seconds at a constant temperature, the
concentration is measured to be C=0.174 ± 0.005 mol/L. Assume that time can be measured with negligible uncertainty.
a. Estimate the rate constant k, and find the uncertainty in the estimate. The units of k will be 
.
b. Find the relative uncertainty in k.
c. The half-life 
of the reaction is the time it takes for the concentration to be reduced to one-half its initial value. The half-life is related to the rate constant by =(ln 2)/k. Using the result found in part (a), find the uncertainty in the half-life.
d. Find the relative uncertainty in the half-life.
Which of the following human actions is most apt to result in a long term increase in soil pH?
A) application of NH4- containing fertilizers B) emission of gases from automobiles C) application of unlimed sewage sludge D) irrigation with high sodium salt-containing waters E) application of farm manure
Which of the following procedures would an entity most likely include in its disaster recovery plan?
A. Convert all data from external formats to an internal company format. B. Maintain a program to prevent illegal activity. C. Develop an auxiliary power supply to provide uninterrupted electricity. D. Store duplicate copies of files in a location away from the computer center.